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Your search keyword '"Deepti Das Krishna"' showing total 3 results
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3 results on '"Deepti Das Krishna"'

1. Simplistic metasurface design approach for incident angle and polarization insensitive rcs reduction

Author

K. K. Indhu, A. P. Abhilash, R. Anilkumar, Deepti Das Krishna, and C. K. Aanandan

Subjects
Polarisation insensitive, Incident angle stability, Radar cross section reduction, Polarisation conversion ratio, Checker board reflective surface, Medicine, Science
Abstract

Abstract This paper proposes the design of a metasurface for polarization and incident angle-insensitive RCS reduction applications. An ellipse-shaped unit cell is utilized as a polarization converter, which is then arranged to form a checkerboard surface. While a single layer checkerboard structure gives a wideband RCS reduction, a double layer structure yields polarization and incident angle independent operation. The two layers have unit cells rotated 450 to each other. Experimental results demonstrate an RCS reduction bandwidth of around 90%. Further the RCS reduction remains stable with polarization and incident angle variation.

Published
2024
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2. Wearable Antennas and Systems

Author

Paul R. Young, C. K. Aanandan, Thomaskutty Mathew, and Deepti Das Krishna

Subjects
Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
Published
2012
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3. Memristor Based Planar Tunable RF Circuits

Author

Marco Ottavi, Babita R. Jose, Jimson Mathew, Chithra Liz Palson, and Deepti Das Krishna

Subjects
Computer science, 020208 electrical & electronic engineering, 020206 networking & telecommunications, Hardware_PERFORMANCEANDRELIABILITY, 02 engineering and technology, General Medicine, Memristor, Settore ING-INF/01 - Elettronica, law.invention, Planar, CMOS, Hardware_GENERAL, Hardware and Architecture, law, Hardware_INTEGRATEDCIRCUITS, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Electrical and Electronic Engineering, Electrical impedance, Electronic circuit
Abstract

Memristors have been recently proposed as an alternative to incorporate switching along with traditional CMOS circuits. Adaptive impedance and frequency tuning are an essential and challenging aspect in communication system design. To enable both, a matching network based on switchable capacitors with fixed inductors is proposed in this paper where the switching is done by memristive switches. This paper analyzes the operation of memristors as a switch and a matching network based on memristors which adaptively tunes with impedance and frequency. With three capacitor banks of each 0.5 pF resolution and two fixed inductors, matching for antenna impedance ranging from 20 to 200[Formula: see text]Ohms and for frequencies ranging from 0.9 to 3.2[Formula: see text]GHz is reported. Thereafter, an adaptive planar band-pass filter is implemented on CMOS technology with two metal layers. This adaptive frequency tunable band-pass filter uses a [Formula: see text] network with resonator tanks in both arms that operates at 2.45 GHz. It is tunable from 2.8[Formula: see text]GHz to 7.625[Formula: see text]GHz range. This tunability is achieved using tunable spiral inductor based on memristive switches. The proposed filter layout is implemented and simulated in ANSYS Designer. The initialization and the programming circuitry to enable adaptive switching of the memristive devices has to be addressed. Since RF memristive devices are not commercially available, circuit level simulations are done as a proof of concept to validate the expected results.

Published
2019

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